When looking at the admin dashboard, you will notice that there is an entry
to administrate Routes. The administration class of the RoutingBundle has
been automatically registered. However, you do not need this in your
application as the routes are managed by the RoutingAutoBundle and not the
administrator. You can disable the RoutingBundle admin:

Routes used by the tree in the frontend are handled by the FOSJsRoutingBundle.
The relevant routes are tagged with the expose flag, they are available
automatically. However, you need to load the routes of the TreeBundle
and the FOSJsRoutingBundle:

To have a document show up in the tree, it needs its own entry. You
can allow all document types underneath it by having the all child.
But if you explicitly list allowed children, the right click context
menu will propose only those documents. This makes it easier for your
users to not make mistakes.